RF2510 データシートの表示（PDF） - RF Micro Devices

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RF2510

VHF/UHF transmitter

RF Micro Devices 

Preliminary

RF2510

Pin Function Description

Interface Schematic

1

OSC B

This pin is connected directly to the reference oscillator transistor base.

The intended reference oscillator configuration is a modified Colpitts.

VCC2

An appropriate capacitor as chosen by the customer should be con-

nected between pin 1 and pin 2.

OSC B

OSC E

2

OSC E

This pin is connected directly to the emitter of the reference oscillator See pin 1.

transistor. An appropriate capacitor as chosen by the customer should

be connected from this pin to ground.

3

GND1

Ground connection for the VCO OUT buffer amp.

4

VCO OUT Buffered output of the VCO

VCC

20

VCO OUT

5

VCC

This pin is used to supply DC bias to the entire IC. ARF Bypass capac-

itor should be connected directly to ground.

6

GND

Ground connection.

7

PD

Power Down control for all circuitry. When this pin is a logic “low” all cir-

cuits are turned off.

PLL ENABL

50 kΩ

8

NC

Not internally connected.

9

MOD CTRL This pin is used to select the prescaler modulus. A logic “high” selects

64 or 128 for the prescaler divisor. A logic “low” selects 65 or 129 for

the prescaler divisor.

MOD CTL

10

DIV CTRL This pin is used to select the desired prescaler divisor. A logic “high”

selects the 64/65 divisor. A logic low selects the 128/129 divisor.

DIV CTL

11

11

RESNTR- The RESNTR pins are used to supply DC voltage to the VCO, as well RESNTR+

as to tune the center frequency of the VCO. Equal value inductors

should be connected to this pin and pin 13.

RESNTR-

12

MOD IN FM analog or digital modulation can be imparted to the VCO through See pin 11.

this pin. The VCO varies in accordance to the voltage level presented

to this pin. To set the deviation to a desired level, a voltage divider refer-

enced to Vcc is recommended. Because the modulation varactors are

part of the resonator tank, the deviation is slightly dependent upon the

components used in the external tank.

13 RESNTR+ See pin 11.

See pin 11.

14

LOOP FLT Output of the charge pump. An RC network from this pin to ground is

used to establish the PLL bandwidth.

VCC

4 kΩ

MOD IN

LOOP FLT

Rev A6 010207

11-3

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